Improvements in rock drills,申请号GB19560018800-传众专利搜索

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发明名称	Improvements in rock drills
摘要
申请公布号	GB791729(A)	申请公布日期	1958.03.12
申请号	GB19560018800	申请日期	1956.06.18
申请人	HELLEFORS BRUKS AKTIEBOLAG	发明人
分类号	E21B10/40;E21B10/56;E21B10/58	主分类号	E21B10/40
代理机构		代理人
主权项
地址

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